A Green-function theory of plasmons in two-dimensional semiconductor structures: Finite magnetic field (Q1283534)

The magnetoplasmon excitations in several two-dimensional semiconductor structures placed in magnetic field, are investigated in the framework of a Green-function theory. The magnetic field is assumed to be parallel to the interfaces and perpendicular to the direction of propagation (Voigt geometry). The material layers are characterized by frequency-dependent dielectric function, and the quantum-size effects are ignored. The authors derive explicit expressions for the response functions associated with electromagnetic fields. It is shown that previous well-established results can be reproduced with this theory, and that the excitation spectrum in Voigt geometry contains a magnetic-field-dependent gap within which the magnetoplasmons cannot propagate.